Finding the Fourth Proportional to 1,359.72, 1,876.23 and 770.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.72 : 1,876.23 = 770.31 : x
2. Step 2: Convert to fraction form
   1,359.72/1,876.23 = 770.31/x
3. Step 3: Cross multiply
   1,359.72x = 1,876.23 × 770.31
4. Step 4: Simplify right side
   1,359.72x = 1,445,278.73
5. Step 5: Solve for x
   x = 1,445,278.73/1,359.72
6. Step 6: Final answer
   x = 1,062.92